4020111 has 20 divisors (see below), whose sum is σ = 6202944. Its totient is φ = 2592000.

The previous prime is 4020031. The next prime is 4020119. The reversal of 4020111 is 1110204.

It is a happy number.

It is not a de Polignac number, because 4020111 - 2¹⁹ = 3495823 is a prime.

It is a super-2 number, since 2×4020111² = 32322584904642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 4020093 and 4020102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020119) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1711 + ... + 3311.

Almost surely, 2^4020111 is an apocalyptic number.

4020111 is a deficient number, since it is larger than the sum of its proper divisors (2182833).

4020111 is a wasteful number, since it uses less digits than its factorization.

4020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1635 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 4020111 is about 2005.0214462693. The cubic root of 4020111 is about 159.0056957732.

Adding to 4020111 its reverse (1110204), we get a palindrome (5130315).

The spelling of 4020111 in words is "four million, twenty thousand, one hundred eleven".